CVS commit: src/lib/libc/arch/mips/gen

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Fri Apr 25 00:08:38 UTC 2025

Modified Files:
        src/lib/libc/arch/mips/gen: _resumecontext.S

Log Message:
mips __resumecontext: Align private stack frame size.

On mips64, UCONTEXT_SIZE is 664=0x298 (n32) or 744=0x2e8 (n64), but
sp is required to have 16-byte alignment in the ABI, so we need to
round the stack frame allocation up to 0x2a0 or 0x2f0.

No functional change intended on mips o32.  Unlikely to have a
practical change on mips n32/n64, but possible if signal delivery
wins a race -- until we fix sp alignment in signal handler calls,
coming soon.

Based on a patch by rin@.

PR kern/59327: user stack pointer is not aligned properly


To generate a diff of this commit:
cvs rdiff -u -r1.13 -r1.14 src/lib/libc/arch/mips/gen/_resumecontext.S

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.